UBL3 Interaction with α-Synuclein Is Downregulated by Silencing MGST3

Area of Science:

• Neurobiology
• Molecular Biology
• Cell Biology

Background:

• Ubiquitin-like 3 (UBL3) facilitates protein sorting into extracellular vesicles.
• Alpha-synuclein (α-syn) aggregation is implicated in Parkinson's disease pathology.
• The interaction between UBL3 and α-syn has potential implications for neurodegenerative disease mechanisms.

Purpose of the Study:

• To identify regulators mediating the interaction between UBL3 and α-syn.
• To investigate the role of MGST3 in modulating the UBL3-α-syn interaction.
• To explore the impact of oxidative stress on the UBL3-α-syn interaction.

Main Methods:

• Split luciferase complementation assay to study protein interactions.
• RNA interference (RNAi) to silence specific genes.
• Immunocytochemistry to assess protein co-localization.
• Hydrogen peroxide (H2O2) treatment to induce oxidative stress.

Main Results:

• Several genes (QSOX2, HTATIP2, UBE3C, MGST3, NSF, HECTD1, SAE1, ATG3) were identified as downregulating the UBL3-α-syn interaction.
• Silencing MGST3 demonstrated the most significant reduction in the UBL3-α-syn interaction.
• MGST3 silencing led to decreased co-localization of UBL3 and α-syn.
• Oxidative stress induced by 800 µM H2O2 downregulated the UBL3-α-syn interaction.

Conclusions:

• MGST3 plays a significant role in downregulating the interaction between UBL3 and α-syn.
• Silencing MGST3 reduces the UBL3-α-syn interaction, potentially impacting α-syn clearance.
• Oxidative stress influences the UBL3-α-syn interaction, highlighting a link to cellular defense mechanisms.